exists and is an alternate of . Since this is regarding statistics I assume you mean lower case sigma (Ï) which, in statistics, is the symbol used for standard deviation, and Ï2 is known as the variance.
The Acceptable Quality Limit, commonly referred to as AQL, is a method widely used to measure a production order sample to find whether or not the entire product order has met the client's specifications. The customer then has the data to make an informed decision to accept or reject the lot.
AQL tables for product inspections. These statistical tables are fundamental tools for preparing a sampling plan for a random product inspection. They give you the number of samples to inspect, and the maximum numbers of defects that is allowed. The first table gives you the code letter for sampling. In this example, if the batch to check contains 5,000 pcs, and if you choose level II (which is chosen by default for most inspections), the letter is L.